/Engine/Plugins/Online/OnlineServices/Source/OnlineServicesCommon/Public/Online/SessionsCommon.h
ISessions.
virtual [TOnlineResult](API\Plugins\OnlineServicesInterface\Online\TOnlineResult)< [FGetAllSessions](API\Plugins\OnlineServicesInterface\Online\FGetAllSessions) > GetAllSessions ( [FGetAllSessions::Params](API\Plugins\OnlineServicesInterface\Online\FGetAllSessions\Params) && Params ) const